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isn-discuss - Re: [isn-discuss] Format of NAPTR records

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Re: [isn-discuss] Format of NAPTR records

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  • From: James Cloos <>
  • To:
  • Subject: Re: [isn-discuss] Format of NAPTR records
  • Date: Sun, 01 Oct 2006 10:05:16 -0400
  • Copyright: Copyright 2006 James Cloos

>>>>> "Dale" == Dale Worley
>>>>> <>
>>>>> writes:

Dale> As far as I can tell from reading the current RFC that governs NAPTR
Dale> records, RFC 3402 section 3.2, the substitution specified in the NAPTR
Dale> record must be applied to "the String" in a similar manner as is done
Dale> by the "sed" program, which is that the substring that is matched by
Dale> the regexp is to be replaced by the string generated by the
Dale> replacement field.

Unfortunately the rfc does not specify that well enough¹. And clearly
implementors have presumed that the proper result is to replace the
entire input with the replacement string, rather than just the matched

This should be brought up on the appropriate ietf wg (whichever one
that is :).

But I agree that it would be more robust to change over as many ISN
naptr RRs as possible to match Dale's suggestion. It can't break
anything and it just might fix things for some users (if any are
experiencing problems due to differing interpretations of the rfcs).


[1] 'sed-like' is nowhere near specific enough; either interpretation
remains possible w/o further guidance.

James Cloos

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